This is a note to let you know that I've just added the patch titled
PCI: Enable INTx in pci_reenable_device() only when MSI/MSI-X not enabled
to the 3.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
pci-enable-intx-in-pci_reenable_device-only-when-msi-msi-x-not-enabled.patch
and it can be found in the queue-3.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 866d54177b4e671cd52bed1fb487d140d7b691f5 Mon Sep 17 00:00:00 2001
From: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Date: Fri, 7 Mar 2014 16:06:05 -0700
Subject: PCI: Enable INTx in pci_reenable_device() only when MSI/MSI-X not enabled
From: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
commit 866d54177b4e671cd52bed1fb487d140d7b691f5 upstream.
Andreas reported that after 1f42db786b14 ("PCI: Enable INTx if BIOS left
them disabled"), pciehp surprise removal stopped working.
This happens because pci_reenable_device() on the hotplug bridge (used in
the pciehp_configure_device() path) clears the Interrupt Disable bit, which
apparently breaks the bridge's MSI hotplug event reporting.
Previously we cleared the Interrupt Disable bit in do_pci_enable_device(),
which is used by both pci_enable_device() and pci_reenable_device(). But
we use pci_reenable_device() after the driver may have enabled MSI or
MSI-X, and we *set* Interrupt Disable as part of enabling MSI/MSI-X.
This patch clears Interrupt Disable only when MSI/MSI-X has not been
enabled.
Fixes: 1f42db786b14 PCI: Enable INTx if BIOS left them disabled
Link: https://bugzilla.kernel.org/show_bug.cgi?id=71691
Reported-and-tested-by: Andreas Noever <andreas.noever@xxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
CC: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/pci/pci.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1134,6 +1134,9 @@ static int do_pci_enable_device(struct p
if (dev->msi_enabled || dev->msix_enabled)
return 0;
+ if (dev->msi_enabled || dev->msix_enabled)
+ return 0;
+
pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
if (pin) {
pci_read_config_word(dev, PCI_COMMAND, &cmd);
Patches currently in stable-queue which might be from bhelgaas@xxxxxxxxxx are
queue-3.13/pci-designware-fix-rc-bar-to-be-single-64-bit-non-prefetchable-memory-bar.patch
queue-3.13/pci-enable-intx-in-pci_reenable_device-only-when-msi-msi-x-not-enabled.patch
queue-3.13/pci-designware-fix-iatu-programming-for-cfg1-io-and-mem-viewport.patch
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